Tech Focus: Global Illumination What It Is, How Does It Work And Why Do We Need It

Welcome to a brand new Tech Focus In this video, delivered with early access to DF Supporter Program backers, Alex goes into depth of Global Illumination or GI. What is it, how does it work, what are the implementations with rasterisation and ray tracing 00:00 Introduction 01:13 Part I Theory: What is Global Illumination 04:33 Part I Theory: How does ray tracing simulate lighting 06:45 Part I Theory: How does rasterisation emulate lighting 10:42 Part 2 Technique: Lightmaps 17:14 Part 2 Technique: Ambient Colour 19:54 Part 2 Technique: Imagebased Lighting with Cubemaps 27:30 Part 3 Technique: Probebased Indirect Lighting 32:21 Part 4 Conclusion Join the DF Patreon for pristine video downloads, behind the scenes content, early access to DF Retro, early access to DF Direct Weekly and much, much more: Subscribe for more Digital Foundry: Want some DFbranded teeshirts, mugs, hoodies or pullovers Check o